Coating material useful in the manufacture of artificial leather



heated rollers. Another object of my invention 1 Parts r is the manufacture of artificialleather with the Nitrocellulose 100 coating material thus obta ned. Castor oil v 100 Coating material to be applied for example in camphor the manufacture of artificial leather has hither- Lamp black 50 to been made by milling the coloring matter with Alcohol 100 Patented Aug. 2s, 1934 1,971,398

UNITED STATES PATENT OFFICE COATING MATERIAL USEFUL IN THE MAN- UFACTURE OF ARTIFICIAL LEA'IIIER.

Alfons Fausten, Leiplil, Germany, assignor to I. G. Farbenindnstrie Aktiengesellschaft, Frankfort-on-the-Main, Germany, a corporation of Germany No Drawing. Application December 10, 1928, Serial No. 325,127. In Germany December 13,

The present invention relates to a coating maorate. This contrasts favorably with varnishes terial for producing nontransparent coatings, made by the known methods. and more particularly to coating materials ob- The following examples illustrate the inventained by working a mixture of cellulose ester, tion, without limiting it thereto, the parts being 5 a softening or gelatinizing agent, an insoluble by weight:-- v

pigment and a swelling agent under pressure on v castor oil in a color mill to produce a paste of thick consistency;- nitrocellulose was gelatinized mixed in kneading machine d are w rk d 15 in th pr of a w l agent and Softenfor two hours on rollers which are heated to 8 a The 00101 p te and the gelati about 60-80" C., under a pressure of about 30-100 nitrocellulose were milled together in a plate mill atmospheres, until the content of 910, 11. 1 is -9. or kneading machine in order to form a uniform duced to about 20 parts; Themass leaves the d pp r tly homog n maSS- rollers in the form of a pliant elastic plate or 20 The artificial leather made with this coating th th character 1 crepe rubber,

material has a dull surface; in order to make it lustrous it has been coated with a lacquer. By. Ex mpl 2 carrying the subdivision of the pigment to a 001- Parts of loidal condition there is indeed obtained a lus- Acetylcellllrose 100 26 trous coating which, however, is transparent and -T1'i80etin r dimethylphthalate 130 therefore cannot'be used in the production of Alcohol 100 artificial leather. Ochre 1 35 According'to this invention a lustrous and nontransparent coating, that is to say'one with a are mixed in kneadmg macmne and 50 good covering power, which is at the same time worked on rollers for 2V2 hours in the manner of a high degree of toughness and of a soft feel, described in Example There is obtained a is obtained by using a coating material the com product of properties similar to those described stituents of which are thoroughly subdivided and in Example s most intimately mixed by an intensive working In this manner there produced an elastic or 36 in a suitable machine; for instance on rollers; rubber'uke mas-s containing -9 9'. this working, however, is carried only. so far that portion an on and homogenized such a the color pigment or fining agent does not pass degree that there is no separation of oil even the colloidalcondmon; when the mass is subjected to premures of about The subdivision r the coloring or filling mat atmspheres- It is thus Wssible Provide a "o the coating material is-leasfly controlled by the user with a homogeneous solid material, it 06 being only necessary to dissolve a measured dissolving the mixture in a suitable solvent. In the first instance, 7 apparently homogeneous quantity of the material in a suitable solvent in mixture is obtained from which, however, the a (10W containing all the necespigment or filling agent settles after some hours.- ingredient in the Pmper pmmrtions- 45 Coatings, obtained with such a coating macoating materials fi as described in terial have the advantages of a high degree of the examples y be dissolved n t e man resistance to cracking and of highextensibility, 1161 in a Solvent 011W boiling P n an 1 11 even when the content of pigment or filling agent sary after further addition of oil, may be applied is high. An essential advantage of -the inven-- to suitable supports, such as textile webs. when 50 tion is that it renders possible the use of coating the product is completely dry it constitutes an 106 materials which have a comparatively low conartificial leather which is lustrous, of soft feel, tent of the gelatinizing' agent, which is generally of high resistance to cracking and of high excostly, and therefore a higher content of pigtensibility.

inent or filling agent and oil, without liabilty for In the following claims the term "plastifying 56 the oil to separate or for the quality to deteri-.- agent comprises the softening and gelatinizing 110,

I is reduced to about to about 60-80 C. under a pressure of about- -100 atmospheres until the content of 2. The process of ma acturing a coating material which consists in thoroughly subdividing and most intimately mixing a cellulose ester, a gelatinizing agent, a substantial proportion of alcohol an oil at least equal to the quantity of the cellulose ester, and a pigment by working the materials together on heated rollers under a pressure of about 30 to 100 atmospheres in the presence of a volatile solvent in an amount insufllcient to dissolve the cellulose ester, under such conditions of temperature that a large proportion of the solvent is evaporated during the operation, but without bringing the pigment into the colloidal condition.

geiatinizing agent, a substantial proportion of an oil at least equal to the quantity of the celluloseester, and a pigment by working the materials together on rollers heated to about to C. under a pressure of about 30 to 100 atmos-' pheres in the presence or a volatile solvent in an amount insufllcient to dissolve the cellulose ester, for 1 to 5 hours, until a large proportion of the solvent is evaporated during the operation, but without bringing the pigment into the colloidal condition. 7

4. The process 01 manufacturing a coating material which consists in thoroughly subdividing and most intimately mixing nitrocellulose, camphor, a substantial proportion of castor oil at leastequal to the quantity of nitrocellulose, a pigment, and alcohol in an amount insuflicient to dissolve the nitrocellulose by working the materials together ior about 2 hours on rollers heated to about 60 to 80 C. under. a pressure of about 30 to 100 atmospheres.

ALFONSFAUS'I'EN. I 

